Help changing my password

I keep trying to change my password and I go through a bunch of steps, but then xfinity displays a page that says "Hmm, the page didn't load correctly" and then "Try refreshing the page, if the problem persists, try again later."  Well I tried later, same results.  That was last night.  I thoight may "later" means the next day, so here I am the next day getting the same.  Why won't comcast/xfinity let me change my email password??